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COMP Cams 11-602-20 Thumpr Nitrous 243/257 Hydraulic Flat Tappet Camshaft for Chevy Big Block

(Chevrolet Camaro 1967-72, Corvette 1965-74, Impala 1965-76, Malibu 1966-67, 1973-75, C1500 1990-93, Chevelle 1965-73, Blazer 1973-74 + 105 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

11-602-20
4 reviews
Sale Price

$422.95

1 left at this price

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Usually delivered within 2 days

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Product Details

The COMP Cams Thumpr Nitrous Hydraulic Flat Tappet Camshaft is specifically engineered for big block Chevrolet engines (396-454 cubic inches) running nitrous oxide systems. This performance camshaft delivers an aggressive idle with excellent throttle response and strong mid-range to top-end power, making it ideal for street/strip applications with power adders.

Camshaft Specifications:

  • Advertised Duration: 243° Intake / 257° Exhaust
  • Duration at .050": 224° Intake / 234° Exhaust
  • Valve Lift: .533" Intake / .540" Exhaust (with 1.7:1 rocker ratio)
  • Lobe Separation Angle: 110°
  • Hydraulic flat tappet design for reliable street performance
  • Optimized for engines equipped with nitrous oxide injection systems

Key Features:

  • Thumpr series signature choppy idle sound
  • Compatible with stock to mildly modified cylinder heads
  • Works with factory or aftermarket fuel injection and carburetor systems
  • Recommended RPM range: 1,800-6,000 RPM
  • Requires aftermarket valve springs and typical performance valve train components

This camshaft is designed for use with performance valve springs, retainers, and lifters (sold separately). COMP Cams recommends using their break-in additive and following proper cam break-in procedures to ensure maximum durability and performance.

Products specifications

Fits

Chevrolet Camaro 1967-72, Corvette 1965-74, Impala 1965-76, Malibu 1966-67, 1973-75, C1500 1990-93, Chevelle 1965-73, Blazer 1973-74, C10 Pickup 1968-80, Caprice 1966-76, C10 1975-81, El Camino 1967-75, Monte Carlo 1970-75 + 100 more models

Advertised Exhaust Duration

312

Advertised Intake Duration

295

Basic Operating RPM Range

2,300-6,200

Grind Number

295TH7

Cam Type

Hydraulic Flat Tappet

Intake Valve Lift

0.522

Exhaust Valve Lift

0.507

Intake Duration at .050 Inch Lift

243

Exhaust Duration at .050 inch Lift

257

Camshaft Material

Nitrided Cast Iron

Assembly Lubricant Included

Yes

Lifters Included

No

Valve Springs Required

Yes

Lifter Type

Hydraulic Flat Tappet

Prop 65

WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov

C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967?

Yes, but must meet tailpipe emission standards for year of vehicle.

C.A.R.B. Exempt for On-Road Vehicles?

No

C.A.R.B. Exempt for Racing and Off-Road Only Vehicles?

Yes, but must be a race/competition only vehicle.

C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965?

Yes, but must meet tailpipe emission standards for year of vehicle.

C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967?

Yes, but must meet tailpipe emission standards for year of vehicle.

Camshaft Gear Attachment

3-Bolt

LOBE SEPARATION

107

Usage

Street/Strip

AMAZON ASIN

B002EDX1L6

Camshaft Series

Thumpr

Engine Family

Chevrolet 396-454 c.i. 8 Cylinder (1967-1996)

Great Price on products and Shipping

Fast shipping, Good communication, Highly recommended.!!!

Always really great prices from these guys. Believe me, I always look around and always come back to autoplicity. I ordered a super heavy part and shipping was very reasonable. This is my 5th order with these guys. Very happy customer.

quick delivery of the parts I need to fix my jeep

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